body{
    margin: 0px;
    padding: 0px;
    background-color: cadetblue;
}
div{
    width: 50%;
    height: 500px;
    display: block;
    margin: 0px auto;
}
form{
    width: 50%;
    height: 100px;
    display: block;
    margin: 200px auto;
}